This week, I received an email from reader Lisa Templin-Rayborn offering additional details about the car's infamous plastic bubble top (which was not in place the day Kennedy was shot.) She wrote: "I thought I would provide some additional information to you regarding the 'bubble' of President Kennedy's limousine. The company out of Cincinnati subcontracted the plastic bubble to a company based in Salem, Ohio called Kenmuir Plastics, a Northeast Ohio company, which was owned by Lester 'Pete' Kenmuir. The bubble was vacuum-formed by Pete and Richard 'Dick' James, best friends and residents of Lisbon, Ohio. It's just a little piece of information that adds more detail to your research. I know this because my dad was Dick James."

According to Matt Anderson, curator of transportation for The Henry Ford museum in Dearborn, Michigan: "The company still operates in Salem today under the name Ventra Salem Plastics. As the article indicates, Salem Plastics is not identified in any of the Lincoln press material, but that’s not unusual for a subcontractor."

Got any tips of your own related to the JFK limo's history? You can email me at cwynn@dallasnews.com.